Michael Wesch (mwesch on youtube), he of the The Machine is Us/ing Us fame, spoke at length on the anthropology of Youtube in an entertaining and enlightening lecture delivered at the Library of Congress about a month ago. This delightful one-hour long video titled 'An anthropological introduction to YouTube' is up on youtube - naturally :)
Wesch's channel on youtube is truly worth subscribing to. He and his students (he is a professor of Cultural Anthropology and Media Ecology at Kansas State University) have created some eye-opening videos that explore the impact of web 2.0 on human interaction, like this telling video titled The Vision of Students Today on what the 21st century student looks like and what education should look like to cater to the needs of such a student.
So if you missed the Numa Numa wave on youtube, now is your chance to catch up, catch on and enjoy :)